Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3a2b78a107928e…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 01:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bea9783de7737f7e1598ccbbdb0d38dd SHA-1: 53dae4f8e0ee25579426bfd33264577254790e39 SHA-256: bd3a2b78a107928e08e84be2603c98e8e28770c204bca9dc1f8bb0ed714c0a79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many hosted on compromised or disposable domains. The presence of numerous embedded URLs, some pointing to compromised CMS upload storage, strongly suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://myxroad.net/upload/userfiles/file///464524749.pdf In PDF document text
    • http://pizzeriadevita.it/userfiles/files/75640132374.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3df11c64b43b06059e2cc14682c9f221/75302473568.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ror7dke6l493rksm4rv6rvg6m5/vomixozetenibowaxafela.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/59985465440.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f80144e329---wufotidupuzox.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/34443251946.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/nifupofapej.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8911386663ce60db63eded8c64bf0d42/77542937403.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/sezix.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/fuwawitizomepipati.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/vaninarepiguxebosesu.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/lisux.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/posakepufoxigulanutev.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/vidomamifiwi.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/32434639574.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/20848581090.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/47773686502.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/zukarekosibelaserorupipi.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/vorunurilinakixaxolinedod.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/60560367139.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/fadabuf.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/vinafalowafe.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/wapunopumesupaxozira.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a3571fe6---76651051169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=days+of+the+week+worksheetsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04E 15608 bytes
SHA-256: 3ea8d21361642b78b6c94aa00dad8e222d57dd4e22efa39e1b002a40fbda40e6
font_01_sfnt_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 10364 bytes
SHA-256: bff513ebbf92b92d82d60ed65029e19d03110fb1fc36f26204ae30edeecb0453
font_02_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1